Re: [photo-3d] plain paper distance

[Paul Talbot <list_post@xxxxxxxxx>]

David's question:

> Basically what I am asking is how far away can my far point be 
> with a given magnification (1:1, 1:2, 1:3, etc.).

Paul Talbot:
> > If he is trying to determine the minimum
> > amount of background he must exclude for the image to work,
> > he needs to run a formula (or a lot of trial and error tests).

"John A. Rupkalvis" 
> Why?  As long as the background is covered so that it cannot be seen, the
> distance is immaterial.  No formula is necessary.

If there are objects throughout the scene from 6 inches
to infinity, it does no good to place a paper background
at 100 feet or even at 10 feet.  Yet it *would* help to
place a paper background at 10 inches.  Somewhere between
10 inches and 10 feet is a cross-over point; in front of
that point the paper helps, beyond that point it does not.

David seems to be looking for a precise answer.  I don't
do photography mathematically myself, but I don't see
any other way to come up with an answer to the question:
"how far away can my far point be?"

Paul Talbot


 

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